Segmented Coil Wireless Power Transmission
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Solution Overview
Problem
Conventional conductive charging methods for electric vehicle batteries pose risks of electric shock, fire hazards, and inconvenience, while existing wireless power techniques face challenges in high-power applications due to high voltage and electromagnetic compatibility issues.
Innovation Solution
A wireless power transmission system utilizing a charging unit with a segmented transmit coil interconnected by capacitors and a receive unit with a similarly segmented receive coil, designed to operate at a resonant frequency to reduce voltage levels and minimize Eddy current losses, facilitating efficient high-power inductive power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If inductive power transfer uses near-field magnetic resonance phenomenon to transmit high power at the range of several decimeters to meters, then power transmission distance and efficiency are improved, but voltage in the sending coil and capacitor reaches thousands of volts causing safety and implementation issues
Solution Approach 1:
The patent divides the coil structure into multiple segments with capacitors interconnecting adjacent coil segments. This segmentation allows the system to achieve the required resonant frequency and power transmission capability while distributing the voltage stress across multiple components, thereby reducing the peak voltage to manageable levels.
Solution Approach 2:
The patent changes the operating parameters by using a segmented coil structure with interconnecting capacitors, which modifies the resonant characteristics and voltage distribution. This parameter change enables the system to operate at the desired frequency range for effective power transmission while maintaining voltage at safe levels.
2Device complexity
If conventional inductive transfer is used within centimeters range, then device simplicity is maintained, but power transmission distance and effectiveness are limited
Solution Approach 1:
The segmented coil structure with interconnecting capacitors extends the effective power transmission distance from centimeters to several decimeters or meters while maintaining reasonable system complexity. The segmentation enables magnetic resonance coupling over longer distances without requiring overly complex system architecture.
3Length of stationary object
If magnetic resonance charging operates at frequency level of hundreds of MHz to GHz, then transmission distance is improved, but electromagnetic compatibility problems intensify and power electronic converter implementation becomes challenging
Solution Approach 1:
The patent selects an intermediate frequency range for operation, avoiding both the very high frequencies (hundreds of MHz to GHz) that cause EMC problems and the very low frequencies that require excessively large components. This parameter optimization achieves effective power transmission distance while maintaining electromagnetic compatibility and simplifying power electronic converter design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables safe, convenient, and efficient high-power wireless charging for electric vehicles by reducing peak voltage and minimizing Eddy current losses, thus overcoming the limitations of conventional methods.
Implementation Method 1
Wireless charger is safe for users as it is innately isolated from the grid. It transfers power via a large gap from transmitting coils to receiving coils mounted on the vehicle.
Implementation Method 2
Inductive power transfer using near-field magnetic resonance phenomenon is relatively novel technique. This technique uses an intermediate range of frequency and it is attractive for power applications, such as wireless power chargers for battery system in electric vehicles, as it can transmit high power effectively at the range of several decimeters to meters.
Implementation Method 3
designed to operate at a resonant frequency to reduce voltage levels and minimize Eddy current losses
Data Source
AI summary
A wireless power transmission system is provided for high power applications. The power transmission system is comprised generally of a charging unit configured to generate an alternating electromagnetic field and a receive unit configured to receive the alternating electromagnetic field from the charging unit. The charging unit includes a power source; an input rectifier; an inverter; and a transmit coil. The transmit coil has a spirangle arrangement segmented into n coil segments with capacitors interconnecting adjacent coil segments. The receive unit includes a receive coil and an output rectifier. The receive coil also has a spirangle arrangement segmented into m coil segments with capacitors interconnecting adjacent coil segments.